PLEASE HELP MY FUTURE DEPENDS ON THIS QUESTION 6

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

Rewrite the following quadratic functions in intercept or factored form. show your work. y = x^2 + 7x + 10

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /